Watertight tester

The utility model relates to a watertight tester, which relates to the technical field of measurement, and comprises a water tank, the top of the water tank is fixedly provided with a transparent cylindrical pipe, the top of the cylindrical pipe is provided with an air inlet and a water replenishing port, the side wall of the cylindrical pipe is provided with scale marks, the water tank is provided with a water outlet, the water outlet is communicated with a water pipe, and the other end of the water pipe is provided with a testing device. A threaded hole is formed in the top of the hollow stand column, an upper clamping block is fixedly arranged at the bottom of the hollow stand column and detachably connected with a lower clamping block, identical first through holes are formed in the center of the upper clamping block and the center of the lower clamping block, the forming area of the first through holes is smaller than the area of a sample to be detected, and rubber gaskets are arranged on the opposite si